diff options
| author | Takashi Iwai <tiwai@suse.de> | 2014-10-28 12:42:19 +0100 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2014-11-13 11:48:49 +0000 |
| commit | 4e4f5b1f2ac93ba5c8076f6e8cb7991305d23c37 (patch) | |
| tree | 3e6e4ccf1cf164e53d91a627c97a5dbc6c33b580 | |
| parent | 2b8ffed36eff00fb2b942096046366d87ce8b549 (diff) | |
ALSA: pcm: Zero-clear reserved fields of PCM status ioctl in compat mode
commit 317168d0c766defd14b3d0e9c2c4a9a258b803ee upstream.
In compat mode, we copy each field of snd_pcm_status struct but don't
touch the reserved fields, and this leaves uninitialized values
there. Meanwhile the native ioctl does zero-clear the whole
structure, so we should follow the same rule in compat mode, too.
Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
| -rw-r--r-- | sound/core/pcm_compat.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c index af49721ba0e3..c4ac3c1e19af 100644 --- a/sound/core/pcm_compat.c +++ b/sound/core/pcm_compat.c @@ -206,6 +206,8 @@ static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream, if (err < 0) return err; + if (clear_user(src, sizeof(*src))) + return -EFAULT; if (put_user(status.state, &src->state) || compat_put_timespec(&status.trigger_tstamp, &src->trigger_tstamp) || compat_put_timespec(&status.tstamp, &src->tstamp) || |